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When should I use the Visitor Design Pattern? [closed]

... build and maintain the children list.] class TreeNode( object ): def __init__( self, name, *children ): self.name= name self.children= children def visit( self, someVisitor ): someVisitor.arrivedAt( self ) someVisitor.down() for c in self.children: ...
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Where is the Keytool application?

...achine, you would normally find the jdk at C:\Program Files\Java\jdk1.8.0_121\bin It is used for managing keys and certificates you can sign things with, in your case, probably a jar file. If you provide more details of what you need to do, we could probably give you a more specific answer. ...
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How can I change the color of pagination dots of UIPageControl?

...ontrolDelegate; @interface PageControl : UIView { @private NSInteger _currentPage; NSInteger _numberOfPages; UIColor *dotColorCurrentPage; UIColor *dotColorOtherPage; NSObject<PageControlDelegate> *delegate; //If ARC use __unsafe_unretained id delegate; } // Set thes...
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Chrome Dev Tools: How to trace network for a link that opens a new tab?

... if(link.attributes.target) { link.attributes.target.value = '_self'; } }); window.open = function(url) { location.href = url; }; share | improve this answer ...
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Add swipe to delete UITableViewCell

... and updating the tableview) } } Swift 3.0: override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool { return true } override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {...
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How can I connect to a Tor hidden service using cURL in PHP?

... You need to set option CURLOPT_PROXYTYPE to CURLPROXY_SOCKS5_HOSTNAME, which sadly wasn't defined in old PHP versions, circa pre-5.6; if you have earlier in but you can explicitly use its value, which is equal to 7: curl_setopt($ch, CURLOPT_PROXYTYPE, 7...
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Wrap a delegate in an IEqualityComparer

...t;T> : IEqualityComparer<T> { readonly Func<T, T, bool> _comparer; readonly Func<T, int> _hash; public FuncEqualityComparer( Func<T, T, bool> comparer ) : this( comparer, t => 0 ) // NB Cannot assume anything about how e.g., t.GetHashCode() interact...
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Can't access object property, even though it shows up in a console log

...cess, but on the very next line of code, I can't access it with config.col_id_3 (see the "undefined" in the screenshot?). Can anyone explain this? I can get access to every other property except field_id_4 as well. ...
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How to parse unix timestamp to time.Time

...ut: 2014-07-16 20:55:46 +0000 UTC Playground: http://play.golang.org/p/v_j6UIro7a Edit: Changed from strconv.Atoi to strconv.ParseInt to avoid int overflows on 32 bit systems. share | improve t...
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How to think in data stores instead of databases?

...operty(db.Key) #all the users who are able to view this league def get_managers(self): # This returns the models themselves, not just the keys that are stored in teams return UserPrefs.get(self.managers) def get_coaches(self): # This returns the models themselves, n...